Warp stop-motion for looms.



No. 643,300. Paented Feb. I3, 1900. C. A. LiTTLEFIELD.

1App1icanon-1ed Nov. 8, 1899.)

(No Model.)

illrrn tric CHARLES A. LITTLEFIELD, OF LOWELL, MASSACHUSETTS, ASSIGNORTO THE DRAPER COMPANY, OF PORTLAND, MAINE, AND IIOPEDALE, MASSACHUSETTS.

`WARPSTOP-IVIOTION FOR LOOIVIS.s

SPECIFICATION forming part of Letters Patent No. 643,300, dated February13, 1900. Application filed November 3, 1899. Serial No. 735,656. (Nomodel.)

To blt whom t may concern:

Be it known that I, CHARLES A. LITTLE- FIELD, of Lowell, county ofMiddlesex, and State of Massachusetts, have invented an Improvement inWarp Stop-Motions for Looms, of which the following description, inconnection with the accompanying drawings, is a specification, likeletters on the drawings representing like parts.

In another application, Serial N o. 735,655, filed by me concurrentlyherewith, I have shown warp-stop-motion mechanism wherein the detectorsare each maintained inoperative by engagement with a pair of crossedwarps at their crossing, the crossing being formed by the division ofthe warps into two groups by the leasing means, the latter being shownas the usual or well-known lease-rods.

In my present invention the detectors are maintained inoperative byengagement with crossed warps 5 but the feeler herein is shown as movedin one direction by warp tension and oppositely by some other means, asa spring, a released detector engaging and arresting the spring-impelledmovement of the feeler to thereby effect the operation of suitablestopping means.

I have in my present invention shown the feeler as operating also as oneof the leasing devices, it acting similarly to the expansiblelease-rod,one form of which is shown in United States Patent No.401,351, 1889.

The particular manner in which the detectors are normally heldinoperative is not herein claimed broadly, as the same is made thesubject-matter of claims in my other application hereinbefore referredto.

Figure 1 is a sectional view of a loom, taken from front to rear,showing one embodiment of my invention applied thereto. Fig. 2 is asectional detail taken on the line a: Fig. 1, looking toward the right,the warps being omitted 5 and Fig. 3 is an enlarged perspective detailshowing the manner in which the detectors engage a pair of crossedWarps.

Ihave herein shown my invention as applied to a loom as the most generaluse thereof 5 but my invention is not restricted to such use orapplication.

granted April 1U,

The loom-frame A, the breast-beam A40, the lay A3, the lay-swords A4,one of which is herein shown, the harnesses I-I, and the shipper S areand may be of any usual or wellknown construction, the shipper operatingbelt-shifting means (not herein shown) to stop the loom when theshipperis released from its usual holding-notch. The knock-ott lever d,pivotally fulcrumed on the loom side at dx, is shown as jointed at a tothe knock-off rod or shaft d2, mounted t0 move longitudinally insuitable bearings d3 of the loom-frame, the said -knock-ofi? rod havingmounted thereon at its rear end a dog d4, which is free to rock upon therod and move longitudinally therewith, said dog being shown in Figs. 1and 2 as extended inward through a hole d20 in the loom side.

I have herein shown a reciprocating bunter b as connected with some partof the lay--as, for instance, the lay-sword A4, pivotally connectedthereto at bx, the bunter being supported by and sliding in aguide-support b2, secured to the loom side, the rear end of the bunterbeing adapted to at times engage the dog a4 to-move the knock-off rodlongitudinally in the direction of the arrow 10, Fig. 1, to effect thestopping of the loom.

The leasing means for the warps is herein shown as comprising alease-rod L of usual construction and an expansible lease rod, hereinshown as comprising a dat bar or plate c, extending across the loombetween the lease-rod L and the Whipbar W and iiX-edly supported onupright stands c', and a feeler f, pivotally connected at f with the barc and normally lifted at its free edge or separated from the bar orplate c by one or more springs s, (see Figs. 1 and 2,) the feeler beingconnected by a link cX with the dog d4. The warps are divided into twogroups, the warps w of one group passing over the feeler and under thelease-rod L, while the warps w in the other group pass over the rod Land .under the bar or plate c, so that between the 95 two leasingdevices the warps of the two groups cross each other in pairs, as at wx,Fig. 3. The spring or springs s normally operate to lift the free edgeof the feeler and to maintain the dog a4 out of the path of move- Iooment of the bunter b, and as the filling is beaten in the tension uponthe warps acts upon the feeler to depress the same against thelifting-spring, so that the dog 0,4 is moved Vinto the bunter-path. Thisrocking of the dog into and out of the feeler-path is effected at eachpick while the apparatus is running properly.

' The apparatus is controlled by a series of detectors d, herein shownas pivoted at their lower ends upon a rod or support dx, secured to thebrackets el', fast on the loom side, the detectors engaging two crossedwarps at their crossing wx (see Fig. 3) and being maintained thereby ininoperative position, the detector crossing one of the warps, as lw, onthe side opposite to that crossed by the other warp, as w', of the part.

Manifestly the detector will be held from operative movement so long asits part of the controlling-warps remains intact, failure of either warpof the part releasing the detector, which swings by gravity toward therear of the loom, as herein shown.

Each detector is notched or hooked at or near its upper end to form ashoulder d2 in its edge turned toward the feeler, and the front edge ofthe latter is provided with an upturned lip fx.

Supposing now that a warp breaks, its detector will be released and willswing rearwardly on its pivot toward and against the feeler, and eitheron that pick or the next succeeding pick the depression of the feeler bywarp tension will carry the lip fx below the shoulder of the releaseddetector, so that upward movement of the feeler will be arrested. Thedog a4 will in consequence be held in its lower position in the path oi'the bunter b as the lay moves back, and the bunter, striking the dog,will operate to move the knock-off rod a2 in the direction of the arrow10, Fig. l, to swing the lever a on its fulcrum and release the shipperto thereby stop the apparatus. When the detector is engaged by thefeeler, as described, it will be subjected to tensile strain, so thatthere will be no danger of bending or buckling said detector, although,as a matter of fact, in my present invention the only strain broughtupon the detector is that sufficient to prevent return of the feeler tothe position shown in Fig. 1.

The feeler and the cross-bar to which it is pivotally connectedconstitute an expanding lease-rod operating substantially in the mannershown and described in the United States patent hereinbefore referredto, and I do not claim an expansive lease device per se, the same notbeing of my invention.

The shipper, the knock-oft device therefor, and the bunter constitute,with the usual beltshifting device, stopping means actuated by orthrough engagement and arrest of the feeler by the release-detector.

Modifications or rearrangements of the structure herein shown may bemade without departing from the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. In a warp-stop -motion mechanism, a feeler moved in one direction bywarp tension, a spring to moveit oppositely, a series ot' detectorsmaintained inoperative by intact Warps, a released detector engaging andarresting spring-impelled movement of the feeler, and stopping meansactuated by or through such arrest of the feeler.

2. In a Warp-stopmotion mechanism, a feeler moved in one direction bywarp tension, a spring to move it oppositely, a series of rocking,shouldered detectors maintained inoperative by intact warps, theshoulder of a released detector engaging and arresting the feeler, whilethe detector is subjected to tensile strain, and stopping means actuatedby or through such arrest of the feeler.

3. In a warp-stop-motion mechanism,a movable feelerextended beneath andtransversely to the warps and intermittingly depressed by warp tension,a spring to lift it, a series of angularly-movable detectors maintainedinoperative byintact warps, a released detector engaging and arrestingspring-impelled movement of the feeler, and stopping means actuated byor through such arrest of the feeler. j 4. In a warp-stop-motionmechanism,a movable feeler extended beneath and transversely to thewarps, and intermittingly depressed by warp tension, a spring to liftit, a series of angularly-movable detectors maintained inoperative byintact Warps, a released detector engaging and arresting spring-impelledmovement of the feeler, and stopping means, including a knock-ott rodprovided with a dog controlled by the feeler, and a bunter, arrest ot'the feeler positioning the dog in the path oi' the bunter, to operatethe knock-oit rod. 5. Inawarp-stop-motion mechanism,aleaserod, a movablefeeler parallel thereto to lease the warps and intermittingly moved inone direction by warp tension, a spring to move it oppositely, a seriesof detectors maintained inoperative by the engagement of each with apair of warps at their crossing between the lease-rod and feeler, adetector released by failure of one of the pair of its controllingwarpsengaging and arresting movement of thefeeler, and stopping meansactuated by or through such arrest of the feeler.

6. Ina warp-stop-motion mechanism,alease rod and a leasing-feeler movedin one direction by warp tension, a spring to move it oppositely, aseries of pivotally-mounted detectors each maintained inoperative byengagement with a pair of Warps at their crossing between the leasingmembers, a released detector engaging and arresting the springim pelledmovement of the feeler, the detector being subjected to tensile strain,and stopping means actuated by or through such arrest of the feeler.

IOO

IIO

7. In a Warp-stop-motion mechanism, leasing members to separate thewarps into groups, one of said members including a feelerspring-actuated in one direction and moved oppositely by Warp strain inbeating up, a series of detectors maintained inoperative by engagementwith a warp of each groupat their crossing between the leasing members,

a released detector engaging and arresting spring-actuated movement ofthe feeler, and stopping means, actuated by or through such arrest ofthe feeler.

8. In a warp-stop-motion mechanism, leasing devices to separate thewarps into groups, one of said devices including a spring-controlledmember, a series of detectors maintained inoperative by engagement witha Warp of each group at their crossing between the leasing devices, adetector when released engaging and arresting normal movement of thespring-controlled member, and stopping means, actuated by or throughsuch arrest of the said member.

9. In a warp-stop-motion mechanism, leasing members to separate theWarps into groups, one of said members having a part mounted to rock, aseries of detectors maintained inoperative by engagement with a warp ofeach group at their crossing between the leasing members, a detector inabnormal position engaging and arresting the normal movement of therocking part, and stopping means actuated by or through such arrest ofthe rocking part.

10. In a warp-stop-motion mechanism, a lease-rod, a rocking feelerparallel thereto to lease the Warps and intermittingly moved in onedirection by warp tension, a spring to move it oppositely, an upturnedlip on the free edge of the feeler, a series of pivotallymounted hookeddetectors each upturned to engage a warp in each group at their crossingbetween the rod and feeler, failure of a warp of a pair releasing itsdetector, the hook of the latter engaging the lip of and arresting thefeeler, and stopping means actuated by or through such arrest of thefeeler.

In testimony whereof I have signed my name tothis specification in thepresence of two subscribing witnesses. K

CHARLES A. LITTLEFIELD. Witnesses:

GEO. I-LSTEVENS, CHAs. B. KENDALL.

